Answer:
Answer should be D. Scientists ignore their own person feelings and interpret data objectively.
Living things are classified as producers or consumers according to
A) Their speed of movement
B) How they obtain food
C) The size of their communities
D) How they reproduce
Answer:
B
Explanation:
Your welcome! Have a great day!
Answer:
b
Explanation:
yw
PLEASE HELP ASAPPPP!!!
Which of the following locations is the site of a convergent plate boundary?
A)
the mid-Atlantic ridge
B)
the Aleutian trench
C)
the Atlantic-Indian ridge
D)
the Pacific/North American plate boundary
Answer:
Maybe (D)
......,.,......
The convergent plate boundary is the movement of the lithospheric plates. The North American plate boundary and the Aleutian trench is the site of convergent plate boundary. Thus, options B and D are correct.
What is a convergent plate boundary?A convergent plate boundary is the type of plate boundary and is marked by the region where the tectonic plates of the lithospheric region collide with each other due to the process of subduction.
The convergent plate boundary can be seen between ocean‐ocean, continent‐continent, and ocean‐continent. The convergent boundary is seen in the Aleutian trench and the North American Plate that is under the subduction process. On the other hand, the Mid-Atlantic Ridge and the Atlantic-Indian ridge has divergent or constructive plate boundary.
Therefore, options B and D. North American plate boundary and the Aleutian trench is the site of convergent plate boundary.
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Students pour some table salt into a beaker with distilled water to make a solution in order to test its conductivity. When they placed a conductivity probe in the salt water solution, it measured a high conductivity. The students repeated the same procedure with white sugar and measured no conductivity. Which of the following statements best explains why sugar is not conductive in solution?
Answer:
the answer is Covalent compounds separate into neutral molecules when they dissolve in water.
Explanation: covalent doesn’t conduct electricity in water
The common salt transforms the distilled water into an electrical conductor. But sugar molecule is a covalent compound which dissolve in water. So the white sugar does not show any conductivity.
What are conductors?The electrical conductors are defined as the materials which allow electricity to flow through them easily. The property of conductors which allow them to conduct electricity is defined as the conductivity. The metals are good conductors of electricity.
The distilled water does not contain any contaminants and it is incapable of conducting even very minute amount of electricity. But during the addition of ordinary salt or sodium chloride to the distilled water, it becomes electrically conductible.
The presence of chlorine and sodium ions makes the distilled water to conduct electricity. Here sugar is a covalent compound which separate into neutral molecules when they dissolve in water. So covalent compounds does not conduct electricity.
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there are 1.204 x 10^24 atoms of oxygen. How many moles is this?
Answer:
7.25 x 10^47
Explanation:
1.204 x 10^24 moles*6.022 x 10^23 avogadro's number= 7.25 x 10^
Two atoms of the element join together at ordinary temperature and pressure to generate dioxygen. Therefore, the correct option is option A.
What is oxygen?The chemical substance with symbol O as well as atomic number 8 is oxygen. It is a component of the periodic table's chalcogen group, a strong oxidizing nonmetal, as well as an oxidizing agent which quickly produces oxides for most elements and other compounds. Oxygen is the most prevalent element on Earth, and it is the third-most plentiful element in the universe after hydrogen and helium.
Two atoms of the element join together at ordinary temperature and pressure to generate dioxygen, a colorless as well as fragrant diatomic gas with both the formula O 2. Diatomic oxygen gas now makes up 20.95% of the Greenhouse effect, however this has fluctuated dramatically throughout time. Oxygen oxides represent more than half of both the Earth's crust.
mole = number of atoms/ 6.022×10²³
= 1.204 x 10²⁴/ 6.022×10²³
= 2 mole
Therefore, the correct option is option A.
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Define: Atomic Mass, Mass Number, Isotope
Answer:
Explanation:
the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
the total number of protons and neutrons in a nucleus.
to write the symbol for an isotope, place the atomic number as a subscript and the mass number (protons plus neutrons) as a superscript to the left of the atomic symbol
What is the purpose of the sojourner rover ????
Answer:
Sojourner is the Mars Pathfinder robotic Mars rover that landed on July 4, 1997 in the Ares Vallis region, and explored Mars for around three months. It has front and rear cameras and hardware to conduct several scientific experiments.
Explanation:
Titanium dioxide (TiO2) is used extensively as a white pigment. It is produced from an ore that contains ilmenite (FeTiO3) and ferric oxide (Fe2O3). The ore is digested with an aqueous sulfuric acid solution to produce an aqueous solution of titanyl sulfate [(TiO)SO4 ] and ferrous sulfate (FeSO4 ). Water is added to hydrolyze the titanyl sulfate to H2TiO3, which precipitates, and H2SO4. The precipitate is then roasted, driving off water and leaving a residue of pure titanium dioxide. (Several steps to remove iron from the intermediate solutions as iron sulfate have been omitted from this description.) Suppose an ore containing 24.3% Ti by mass is digested with an 80% H2SO4 solution, supplied in 50% excess of the amount needed to convert all the ilmenite to titanyl sulfate and all the ferric oxide to ferric sulfate [Fe2 (SO4 )3 ]. Further suppose that 89% of the ilmenite actually decomposes. Calculate the masses (kg) of ore and 80% sulfuric acid solution that must be fed to produce 1000 kg of pure TiO2.
Answer:
2928kg of ore are required.
2585kg of the 80% H₂SO₄ solution are required.
Explanation:
To solve this question we need first to find the moles of titanium in 1000kg of TiO₂. Keeping in mind the 89% of descomposition we can find the mass of the ore and the mass of the 80% sulfuric acid required:
Moles TiO₂ -Molar mass: 79.866g/mol-:
1x10⁶g * (1mol / 79.866g) = 12521 moles Titanium
In mass -Molar mass Ti: 47.867g/mol-:
12521 moles Titanium * (47.867g / mol) = 599341.4g of Ti.
As the ore contains 24.3% of Ti:
599341.4g of Ti = 599.34kg Ti * (100 / 24.3) = 2606kg ore
As the descomposition is just of 89%:
2606kg ore * (100 / 89) =
2928kg of ore are requiredMass 80% sulfuric acid:
12521 moles Titanium = 12521 moles H₂SO₄ * (100/89) = 14068.5 moles of H₂SO₄ are required.
In an excess of 50% =
14068.5 moles of H₂SO₄ are required * 1.5 = 21102.8 moles of H₂SO₄.
The mass is:
21102.8 moles of H₂SO₄ * (98g / mol) = 2068075g = 2068kg of sulfuric acid
That is in the 80%:
2068kg of sulfuric acid * (100/ 80) =
2585kg of the 80% H₂SO₄ solution are required2771.53 kg of titanium ore and 2584.63 kg of 80% H₂SO₄ are required to produce 1000 kg of pure TiO2.
The moles of titanium in 1000 kg of TiO₂ is first determined:
Molar mass of TiO₂ = 79.88 g/molMolar mass of Ti = 47.88 g/molmoles of TiO₂ = mass of TiO₂/molar mass of TiO₂mass of TiO₂ = 1000 kg = 1 * 10⁶g
moles of TiO₂ = 1 * 10⁶g/79.88 g/mol
moles of TiO₂ = 12518.77 moles
1 mole of TiO₂ produces 1 mole of titanium
12518.77 moles TiO₂ produces 12518.77 moles of titanium
mass of titanium = number of moles * molar mass
mass of titanium = 12518.77 moles * 47.88 g/mol
mass of titanium = 599398.70 g
Since the percentage mass of titanium in the ore is 24.3%
mass of ore = 599399.18 g * 100/24.3
mass of ore = 2466661.31 g
mass of ore in kg = 2466.66 kg
Since only 89% of ore decomposed, mass of ore required = 2466.66 kg *100/89
mass of ore required = 2771.52
Mass 80% sulfuric acid required is calculated as follows:
Molar mass of H₂SO₄ = 98.00 g/mol1 mole of titanium requires 1 mole of H₂SO₄Therefore, 12521 moles Titanium = 12521 moles H₂SO₄
Since only 89% of the ore decomposes;
moles of H₂SO₄ required = 12518.77 moles * 100/89
moles of H₂SO₄ required = 14066.03 moles
The H₂SO₄ solution is supplied in excess of 50%moles of H₂SO₄ supplied = 14066.03 moles * 150/100
moles of H₂SO₄ supplied = 21099. 04 moles
mass of H₂SO₄ supplied = number of moles * molar massmass of H₂SO₄ supplied = 21099. 04 moles * 98 g/mol
mass of H₂SO₄ supplied = 2067702 g
Since the solution is only 80% H₂SO₄;mass of 80% H₂SO₄ required = 2067702 g * 100/80
mass of 80% H₂SO₄ required = 2584627.5 g
mass of 80% H₂SO₄ required in kg = 2584.63 kg
Therefore, 2771.53 kg of ore and 2584.63 kg of 80% H₂SO₄ are required to produce 1000 kg of pure TiO2.
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How can a ion become a anion ?
Answer:
Anions. Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions.
Explanation:
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Someone please helpppp!!!!!!Question 7
Iron oxide is reacted with hydrogen gas to produce elemental iron and steam in the following
reaction:
Fe2O3 (s) + 3 H2 (g) → 2 Fe (s) + 3 H2O (g)
What mass of iron will be produced from 875 grams of iron oxide? Show all of your work. (5
points)
answer:
612.5
Explanation:
from the equation, no. of mole of iron oxide is obtaibed from mass over molar mass equals to 5.5 moles, taking mole ratio as 1:2 to get moles of iron as 10.94 moles, then the mass is obtained by moles of iron times molar mass
after an extinction why do plants have to recover first?
Answer:
They are the first life there is and ever was. In order for any animals to live, the need nutrients, and plants have nutrients. they are the beginning of the food chain and also produce the right chemicals for the animals to survive
Calculate the change in temperature of a 650. g sample of water that loses 5480. J of energy
Answer:
2
Explanation:
1) the formula of the energy is:
E=cm*Δt, where E - the value of the energy (5480 J.), c - the specific heat capacity (4200 J/(kg*C)), Δt - the difference between initial temperature and the final one (it is unknown);
2) if to perform the substitution of the values 'E', 'm' and 'c' into the formula above, then
5480=4200*0.65*Δt;
3) to calculate Δt:
Δt=5480/4200/0.65≈2 (°C).
note: the initial temperature is higher than the final.
Why is nitro group called an ambident group?
Answer:
An ambident ("both teeth") group is a group that can attach to another by either of two atoms. A nitro group can bond through either N or O. In organic chemistry, this property gives rise to functional group isomers.
Explanation:
Explanation:
An ambident ("both teeth") group is a group that can attach to another by either of two atoms. A nitro group can bond through either N or O. In organic chemistry, this property gives rise to functional group isomers.
Hope this is fine for you☺️☺️☺️Is Ag3 PO4 ionic or covalent?
In a reaction involving the iodination of acetone, the following volumes were used to make up the reaction mixture: 5 mL 4.0M acetone 5 mL 1.0 M HCl 5 mL 0.0050 M I2 10 mL H2O While keeping the total volume at 25 mL and keeping the concentration of H ion and I2 as in the original mixture, how could you double the molarity of the acetone in the reaction mixture
Answer:
Explanation:
pls give me point so i can ask questions
6 Na + F2 ---> 2 Na3F
What is the molar mass of sodium fluoride as it is shown in the equation?
O 79.984 g/mol
175.936 g/mol
Highlight
137.94 g/mol
087.868 g/mol
Answer:
I don’t know why you mean by “...as it is shown in the equation” but the molar mass for NaF(sodium fluoride) is below
Explanation:
Part A
Which substance is the limiting reactant when 14 g of sulfur reacts with 24 g of oxygen and 28 g
of potassium hydroxide according to the following chemical equation?
2 S(s)+ 3 O2(g) + 4 KOH(q) — 2 K2SO4(aq) + 2 H20(1)
O O2(g)
S(s)
K2SO4
O KOH(aq)
O None of these substances is the limiting reactant.
Yery
Submit
Request Answer
Answer:
KOH is limiting reactant
Explanation:
To solve this question, we need to convert the mass of each reactant to moles. Then, using the balanced reaction, we can find the limiting reactant:
Moles S -Molar mass: 32g/mol-:
14g S * (1mol / 32g) = 0.44mol
Moles O₂ -Molar mass: 32g/mol-:
24g O₂ * (1mol / 32g) = 0.75mol
Moles KOH -Molar mass: 56g/mol-:
28g KOH * (1mol / 56g) = 0.5mol
For a complete reaction of the KOH are required:
0.5mol KOH * (2mol S / 4mol KOH) = 0.25mol S
0.5mol KOH * (3mol O₂ / 4mol KOH) = 0.38mol O₂
As there are 0.44 moles of S and 0.38moles of oxygen,
KOH is limiting reactantSofia goes on a hike on a trail that is 10 km long. She starts at 2:00pm and ends at
5:00pm. The end of the trail is 300m north of the beginning of the trail. What is
Sofia's average velocity?
(Velocity= displacement/time)
100 m/hr S
30 m/hrs
0.01 m/hrs
3.3 m/hr s
Answer:
100 m/hr S
Explanation:
Use formula Velocity = displacement/time
V=? d=300 t=3
V=300/3
V=100
Hope this helps!! :D
Sofia's average velocity is 100 m/hrs using the velocity formula which is displacement/time.
What is average velocity?Speed of an object refers to the change in position of that object concerning time. Velocity on the other hand is nothing, but the speed defined concerning the direction in which an object travels.
Average velocity according to the definition is the ratio of the displacement from point a to point b of an object to the time it takes to make that displacement from point a to point b. It may be noted that we use the term movement instead of distance to emphasise the direction.
Velocity is a vector quantity and average velocity can be found by dividing displacement by time. It is found out as, 300/3=100 m/hrs.
Thus, Sofia's average velocity is 100 m/hrs using the velocity formula which is displacement/time.
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Scientists study the bones of two cat species to understand their evolutionary lineage. Which field of study will help scientists understand the connection?
A.
comparative anatomy
B.
developmental biology
C.
modern technology
D.
molecular biology
How many moles of Fe(OH)3 are produced when 85.0 L of iron(3) sulfate at a concentration of 0.600 mol/L reacts with excess NaOH
Answer:
e = Mc hammer.
Explanation:
. If Kc is the equilibrium constant for a forward reaction, 2 A⇌ B, what is Kc' for the reaction 4 A⇌ 2B?
Answer:
(Kc)^2
Explanation:
For this reaction 4 A⇌ 2B Kc is (Kc)∧².
What is equilibrium constant?The equilibrium constant is the value of the reaction quotient that is calculated from the expression for chemical equilibrium. A thermodynamic equilibrium constant, denoted by , is defined to be the value of the reaction quotient Qt when forward and reverse reactions occur at the same rate. At chemical equilibrium, the chemical composition of the mixture does not change with time and the Gibbs free energy change. Stability constants, formation constants, binding constants, association constants and dissociation constants are all types of equilibrium constants.
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write short note on
a) steam distillation
b) distillation under pressure
c) fractional distillation
I hope it helps you ❤️❤️❤️❤️
Answer:
Steam distillation is a separation process which purifies isolate temperature-sensitive materials, such as natural aromatic compounds. In steam distillation, dry steam is passed through the plant material. These vapours undergo condensation and collection in receivers.
distillation under pressure is used for the purification of those substance which get decompose on their boiling point. so , a suction pump (vaccum) is fitted with a beaker in order to lower it's pressure, due to which boiling pressure decreases. so that it can be distilled of before reaching to its boiling point.
Fractional distillation is a type of distillation which involves the separation of miscible liquids. The process involves repeated distillations and condensations and the mixture is usually separated into component parts. The separation happens when the mixture is heated at a certain temperature where fractions of the mixture start to vaporize.
Explanation:
HOPE IT HELPS YOU
Calculate the Molarity of NaOH in the
solution prepared by dissolving its 4 g
in enough water to form 250 ml of the
solution.
Explanation:
naoh=40g/mol
250ml=0.25dm°3
naoh in g/dm°3=16g/dm°3
naoh in mol/dm°3=16g\dm°3
________
40g/mol
=0.4mol,, is the answer
This compound is treated with two different oxidizing reagents: either H2CrO4 and H2SO4, or with PCC. Draw the major organic product for each of the oxidation reactions. Do not draw inorganic by-products.
Answer:
See explanation and image attached
Explanation:
We were told that one of two different oxidizing agents were used H2CrO4 and H2SO4 or PCC/CH2Cl2.
Now, we must know that when we use H2CrO4 and H2SO4, primary alcohols are converted to aldehydes and then to carboxylic acids while secondary alcohols are converted to ketones.
When we use PCC/CH2Cl2 primary alcohols are converted to aldehydes and does not move further to convert to carboxylic acids while secondary alcohols are converted to ketones.
Recall that tertiary alcohols are not oxidized at all.
Which is an example of a catabolic process?
A. a bomb exploding
B. melting ice cubes
C. the formation of water
D. baking bread
Answer:
baking bread
Explanation:
The presence of yeast makes this catabolic. The yeast is breaking down into smaller units
Answer the following questions using the results of the following Unknown Solution Analysis:
Flame test: red flame Solutions reactions:
ammonium carbonate - white precipitate (ppt.) ammonium phosphate - white ppt. ammonium sulfate - white ppt. Halide test: purple hexane layer
a) What is the complete chemical name of the unknown ionic compound? (0.5 pt).
b) What is its correct chemical formula? (0.5 pt.)
Answer:
(a). strontium iodide.
(b). SrI2.
Explanation:
This question wants to test our knowledge on qualitative part of chemistry practical.
The first part is flame test which is a physical test. The flame test that was done on the com gave red flame.
Deduction: This confirms the presence of Strontium and Calcium.
The next thing is the chemical tests.
(1). Unknown + ammonium carbonate: gives white precipitate (ppt.).
Deduction: presence of Calcium and Strontium ions
(2). Unknown + Ammonium phosphate - white ppt.
Deduction: presence of Calcium and Strontium ions.
(3). Unknown sample + ammonium sulfate - white ppt.
Deduction: presence of Strontium ion confirmed.
(3). Halide test: purple hexane layer.
Deduction: shows the presence of Iodine.
Therefore, the final conclusion can be made as;
(a). The name of the chemical compound is strontium iodide.
(b). The chemical formula for the compound is SrI2.
What methods from this experiment could be used to separate and isolate the cooking oil after the extraction
Hello. Your question is incomplete and it makes it very difficult for it to be answered exactly, but I will try to help you in the best possible way.
An efficient way to separate and isolate cooking oil after extraction is through the separating funnel, which allows other liquids, or oil-insoluble substances to be removed efficiently, allowing only the oil to be removed.
2. How do you find the density of a substance given its mass and volume? Write the equation.
Density =
Answer:Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre.
Explanation:
What mass of sodium chloride is produced when 5.4 g of iron
chloride are used?
Answer:
5.0 g
Explanation:
Step 1: Write the balanced equation
FeCl₂ + 2 Na⁺ = 2 NaCl + Fe²⁺
Step 2: Calculate the moles corresponding to 5.4 g of FeCl₂
The molar mass of FeCl₂ is 126.75 g/mol.
5.4 g × 1 mol/126.75 g = 0.043 mol
Step 3: Calculate the moles of NaCl produced from 0.043 moles of FeCl₂
The molar ratio of FeCl₂ to NaCl is 1:2. The moles of NaCl produced are 2/1 × 0.043 mol = 0.086 mol.
Step 4: Calculate the mass corresponding to 0.086 moles of NaCl
The molar mass of NaCl is 58.44 g/mol.
0.086 mol × 58.44 g/mol = 5.0 g
Find the normality of 0.321 g sodium carbonate in a 250 mL solution.
Answer:
the normality of the given solution is 0.0755 N
Explanation:
The computation of the normality of the given solution is shown below:
Here we have to realize the two sodiums ions per carbonate ion i.e.
N = 0.321g Na_2CO_3 × (1mol ÷ 105.99g)×(2eq ÷ 1mol)
= 0.1886eq ÷ 0.2500L
= 0.0755 N
Hence, the normality of the given solution is 0.0755 N
what is the difference between sea and ocean
The Sea and the ocean are just different terms that mean same thing
Answer:
Explanation:
In terms of geography, seas are smaller than oceans and are usually located where the land and ocean meet. Typically, seas are partially enclosed by land. Seas are found on the margins of the ocean and are partially enclosed by land. ... Seas are smaller than oceans and are usually located where the land and ocean meet.